A method for filling the remaining coal pillars in the re-mined residual mining area with a stepped structure

Abstract

The invention discloses a step type structure filling method for second mining of coal pillars of remnant mining areas. According to the method, on the basis of exploring and ascertaining the remaining coal pillars in the remnant mining areas and pillar mining area distribution situations, step type filling moulds are built and installed; the remaining coal pillars of the remnant mining areas are sequentially side-supported by adoption of a pillar side double-side layered filling method; in addition, a short-wall mechanical second mining working face is arranged; and accordingly, the remaining coal pillars of the remnant mining areas are safely recovered. According to the step type structure filling method for second mining of the coal pillars of the remnant mining areas, the recovery ratio of the coal resources can be increased, the economic benefits can be improved for an enterprise, and dynamic disasters including instantaneous instability, domino instability and the like of pillar type filling bodies in mining fields under the multi-factor coupling effect can also be avoided, so that the long-term stability of the pillar type filling bodies of the mining fields after second mining of the remnant coal is guaranteed.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a method for filling abandoned coal resources in residual mining areas with a stepped structure, and is mainly suitable for safe mining of abandoned coal resources in residual mining areas. Background technique [0002] Restricted by historical technology, economic conditions, etc., many coal mines in my country at the beginning of coal resources have encountered phenomena such as mining thick and discarding thin, mining fat and discarding thin, mining good and discarding inferior, mining easy and discarding difficult, etc., resulting in the abandonment of many coal pillars. At the same time, many mining areas generally adopt column mining to maintain the stability of the overlying rock in the stope, thereby preventing or reducing damage to ground buildings, water bodies, and railways caused by mining. The above-mentioned mining activities left many criss-cross coal pillars of...

AI Technical Summary

Problems solved by technology

When the shock wave generated by the instantaneous instability of the stope filling body transfers and spreads to the adjacent filling body, it may cause the "domino" type of instability and failure of the stope filling body, and then cause dynamic disasters such as rock burst, and bring about surface subsidence and Damage and destruction of buildings, railways and water bodies

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